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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '448731117d5c7a599096000a21cf1122c5a37a4505cbb97611e14b4c39de981e' 
  AND token = 'fn/6Ln/dfI+HgRWRW3q/bPt323G1A8wwvAEdNdzCGNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}